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INVESTMENT BORROWINGS - NARRATIVE (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) subsidiary	Mar. 31, 2025 USD ($)	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Number of insurance subsidiaries that are members of the FHLB | subsidiary	3
Investment borrowings	$ 2,691.7		$ 2,441.7
Federal home loan bank stock	117.2
Interest expense on FHLB borrowings	25.9	$ 26.0
Federal Home Loan Bank Advances
Debt Instrument [Line Items]
Investment borrowings	2,691.7
Federal home loan bank advances, collateral pledged	$ 3,400.0

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